Substances that cause birth defects are collectively called
A. androgens.
B. prostaglandins.
C. teratogens.
D. follicle-stimulating hormones.
E. None of the answer choices is correct.
C. teratogens.
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In which situation would gene cloning occur?
a. a DNA fragment is inserted directly into a bacterium and is replicated b. a DNA fragment is inserted into a plasmid, which is then introduced into a bacterium where the gene is expressed but the plasmid does not replicate c. a DNA fragment is inserted into a plasmid, which is then introduced to a bacterium where the plasmid replicates d. a DNA fragment is inserted directly into a bacterium and is digested by nucleases e. a protein of interest is taken up by a bacterium, which incorporates the protein into its cell membrane
What is the mitochondrion's function in the cell?
a. protein synthesis b. cellular respiration and ATP production c. lipid packaging for export from the cell d. cellular water balance regulation
Which statement is false?
a. A molecule is made of at least two atoms. b. Compounds are made of elements. c. Two atoms of oxygen make a molecule of oxygen. d. Proportions of elements in compounds vary according to their source in nature. e. Elements are found in compounds and molecules.
Which of the following terms is associated with polychaetes?
A. radula B. metamorphosis C. parapodia D. mantle E. visceral mass